Masters Dissertations

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Browsing Masters Dissertations by Subject "Apple growth regulators"

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    Effects of growth regulations in shortening the Juvenile period and rooting of Apple (Malus sylvestvis L.) and peach (Prunus persica L.) cuttings.
    (University of Dar es Salaam, 1980) Nyomora, Agnes M. S.
    Growth tetardanta TIBA (50 ppm applied in July) SADH (1500 ppm applied in June); CEPA (1000 ppm), CCC (2500 ppm) and NAA (100 ppm) applied mid-June in Norway retarded tree heights, stem circumference, and flowering of apple seedlings when applied before the end of the juvenile period. MH (500 ppm) and BA (1000 plan) also applied in June did not affect growth but effectively promoted flowering. A combination of GA (50 ppm) applied in July and calcium nitrate (300 gm/tree) applied in June promoted tree height, stem circumference and flowering. It is concluded that growth retardants SADH, CCC, CEPA, TLBA or high concentration of NAA - 100 ppm should not be applied to seedling trees before they have attained a minimum height of 200 cm and 10 cm thickness and have overgrown. the juvenile period. However growth stimulants GA and/or Nitrogenous fertilizers could be applied to hasten growth. Juvenile cuttings of Apple (cv rGolden Delicious ) and peach (ev. 'Local') rooted better than adult cuttings. Cuttings collected in July and September gave highest rooting while IBA at 0.8% in talcum on apples 0.1% in talcum and IBA 200 ppm with 24 hours soaking was most effective for peach cuttings. It is concluded that hormone (IBA) and phase of growth are beneficial in promoting rooting but the effect of season rather than IBA treatment is the major determinant in rooting responses.